若数列{bn}是等差数列,且bn=sn/(n+c),求常数c
由通项公式bn=sn/(n+c)构造一个新的数列{bn},若{bn}也是等差数列,求非零常数c
设数列bn的前n项和为Sn.且bn=2-2Sn.数列an为等差数列,a5=14.a7=20.求数列bn通项公式.2,若c
等差数列前n项和为Sn且a3a4=117,a2+a5=22,求通项an 若等差数列bn=Sn/(n+c),求非零常数c
设等差数列an的前n项和为sn,已知a6=13,S10=120,设bn=sn/(n+c),且数列bn是等差数列,求非零常
设等差数列{an}的前 n项和为Sn,且 Sn=(an+1)^/2(n属于N*)若bn=(-1)nSn,求数列{bn}的
设数列an前n项和Sn=2n^2,bn为等差数列,且a1=b1,b2*(a2-a1)=b1.设cn=an/bn,求数列c
已知数列的前n项和Sn=An∧2+Bn+C,求{an}成等差数列的充要条件
已知等差数列an,前n项和Sn,且a3>a2,a2a3=45,a1+a4=14.(1)bn=Sn/(n+c),若bn
已知数列{an}得前n项和为sn=an^2+bn(a,b为常数且a不等于0)求证数列{an}是等差数列
已知bn=(2n^2-n)/(n+c)是等差数列,求非零常数c
设数列{bn}的前n项和为sn,且bn=2-2sn;数列{an}为等差数列,且a5=14,a7=20求
设{an}是等差数列,{bn}是等比数列,Sn、Tn分别是数列{an}、{bn}的前n项和.若a3=b3,a4=b4,且